Thermodynamic analysis and system design of a novel split cycle engine concept
Thermodynamic analysis and system design of a novel split cycle engine concept
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新型分体式循环发动机概念的热力学分析和系统设计
DOI：
10.1016/j.energy.2016.02.102
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发表时间：
2016
期刊：
影响因子：
9
通讯作者：
Dong G
中科院分区：
文献类型：
--
作者：
Dong G
分置循环发动机是一种新型的往复式内燃机，具有根本提高效率的潜力。在这种发动机中，压缩和燃烧膨胀过程发生在不同的气缸中。在压缩气缸中，增压空气通过空气的直接冷却通过准等温过程被压缩。然后，在将高压空气引入燃烧气缸之前，利用废气的废热在同流换热器中加热高压空气。燃烧过程在膨胀冲程期间以准等压过程发生。本文对分置循环发动机进行了基本的理论循环分析和一维发动机数值模拟。结果表明，热效率η主要由压缩比CR和膨胀比ER、回热效率σ和温升比N决定。在此基础上，对发动机进行了系统优化。结果表明，将CR从23提高到25，可以改善燃烧和回热过程。通过将膨胀比增加到26，气体交换冲程期间的热损失进一步减少。此外，压缩室和膨胀室的冷却剂温度可以单独控制，以减少壁传热损失。与传统发动机相比，采用分流循环时，总效率提高了21%。结果表明，通过系统优化，分置循环发动机的总热效率可达到53%。
The split cycle engine is a new reciprocating internal combustion engine with a potential of a radical efficiency improvement. In this engine, the compression and combustion–expansion processes occur in different cylinders. In the compression cylinder, the charge air is compressed through a quasi-isothermal process by direct cooling of the air. The high pressure air is then heated in a recuperator using the waste heat of exhaust gas before induction to the combustion cylinder. The combustion process occurs during the expansion stroke, in a quasi-isobaric process. In this paper, a fundamental theoretical cycle analysis and one-dimensional engine simulation of the split cycle engine was undertaken. The results show that the thermal efficiency (η) is mainly decided by the CR (compression ratio) and ER (expansion ratio), the regeneration effectiveness (σ), and the temperature rising ratio (N). Based on the above analysis, a system optimization of the engine was conducted. The results showed that by increasing CR from 23 to 25, the combustion and recuperation processes could be improved. By increasing the expansion ratio to 26, the heat losses during the gas exchange stroke were further reduced. Furthermore, the coolant temperatures of the compression and expansion chambers can be controlled separately to reduce the wall heat transfer losses. Compared to a conventional engine, a 21% total efficiency improvement was achieved when the split cycle was applied. It was concluded that through the system optimization, a total thermal efficiency of 53% can be achieved on split cycle engine.
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